- A
Different STP port type (edge vs network)
STP port type must match on both peers for the same port.
- B
Spanning-tree guard root configured on one peer
Why wrong: Root guard is per interface; if configured differently, it can cause issues but is not a standard consistency parameter.
- C
Mismatched allowed VLANs on the port channel
vPC requires consistent VLAN lists.
- D
Incorrect peer keepalive IP
Why wrong: Peer keepalive affects vPC domain, not member port consistency.
- E
Different MTU settings on the peer-link
Why wrong: MTU on peer-link affects the link itself, not member ports directly.
Question 92 of 1,000
350-601 Network Practice Question
This 350-601 practice question tests your understanding of network. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network team is troubleshooting a vPC issue where one of the member ports is not coming up. Which TWO conditions can cause a vPC member port to fail consistency checks? (Select two.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Different STP port type (edge vs network)
Option A is correct because vPC performs consistency checks on member ports to ensure both peers have identical configurations for certain parameters. A mismatch in STP port type (e.g., one peer configured as 'edge' and the other as 'network') will cause the vPC member port to fail the consistency check and remain down, as STP port type affects BPDU handling and loop prevention.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Different STP port type (edge vs network)
Why this is correct
STP port type must match on both peers for the same port.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Spanning-tree guard root configured on one peer
Why it's wrong here
Root guard is per interface; if configured differently, it can cause issues but is not a standard consistency parameter.
- ✓
Mismatched allowed VLANs on the port channel
Why this is correct
vPC requires consistent VLAN lists.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Incorrect peer keepalive IP
Why it's wrong here
Peer keepalive affects vPC domain, not member port consistency.
- ✗
Different MTU settings on the peer-link
Why it's wrong here
MTU on peer-link affects the link itself, not member ports directly.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between parameters that are checked for vPC consistency (like STP port type and allowed VLANs) versus those that are not (like root guard or peer keepalive), leading candidates to select options that sound plausible but are not part of the consistency check list.
Detailed technical explanation
How to think about this question
vPC consistency checks verify that both peers have identical configurations for parameters like allowed VLANs, STP port type, and native VLAN on the port channel. The STP port type (edge, network, or normal) controls BPDU filtering and loop guard behavior; a mismatch can lead to STP loops or unnecessary TCNs, so Cisco enforces consistency. In a real-world scenario, if one peer sets the port as 'edge' (portfast) and the other as 'network', the vPC member port will be suspended to prevent instability.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this 350-601 question test?
Network — This question tests Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Different STP port type (edge vs network) — Option A is correct because vPC performs consistency checks on member ports to ensure both peers have identical configurations for certain parameters. A mismatch in STP port type (e.g., one peer configured as 'edge' and the other as 'network') will cause the vPC member port to fail the consistency check and remain down, as STP port type affects BPDU handling and loop prevention.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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